Combined arch-plate and shield.



Nb.-762,417. PATENTED111N314,1904.v

F. JOHNSON.

COMBINED ARCH PLATE AND SHIELD.

' rrrrrrrrrrrrrr ED NOV. 11, 1903.

OOOOOO L.

W m um I W/i 56,5: .Eurezifi UNITED STATES Patented June 14, 1904.

PATENT OEEIcE.

COMBINED ARCH-PLATE AND SHIELD.-

SPECIFICATION forming part of Letters Patent No. 762,417, dated June 14,1904.

Application filed November 11, 1903. Serial No. 180,658. (No model.)

To (tZZ 1072 0771, it iii/my concern.- 7

Be it known that I, FREDERICK J OHNSON, a citizen of the United States,residing at South Chicago, in the county of Cook and State of Illinois,have invented a new and useful Combined Arch-Plate and Shield, of whichthe following is a specification.

My invention relates to a combined archplate and shield which isemployed to support an arch during construction an d to protect themechanics from the extreme heat usually present where it is intended tobe used.

My invention is particularly designed to be used in repairing the archesof charging-openings in smeltingfurnaces, but may be used for any kindof similar work.

In smelting-furnaces a power -charging mechanism is employed by means ofwhich a large bucket filled with scrap-iron is pushed into the chargingopenings and after being emptied inside the furnace is again withdrawnthrough said opening. WVhile this bucket is being passed through thecharging opening, either the bucket or the scrap-iron extending out ofthe bucket occasionally strikes the edge of the said openingaccidentally, and thus seriously mutilates the brickwork forming thecontour of the opening. In actual practice it is found that the archesforming the upper side of the charging-openings are most frequentlybroken. This multilation must be repaired while the furnaces are inoperation to enhance their efficiency. It is necessary to protect themechanics while repairing the mutilation from the extreme heat withinthe furnace. Heretofore the mechanic was protected by a temporary brickwall'built into the chargingopening, and after the multilation wasrepaired the brick wall had to be removed. My invention obviates thenecessity of building any temporary protecting-wall whatsoever.

My invention consists of providing a port able protectingwall composedof any suitable material, as cast-iron, fire-brick, or asbestos, andarranged to fit the charging-openings. The charging-openings in afurnace or set of furnaces are all the same size, so that aprotecting-wall made to fit one will fit all. I prefer to provide theprotecting-wall with an arch-supporting plate, although this is notabsolutely necessary. I believe I am the first person to construct aportable protecting-wall for'si'nelting-furnaces and lay claim to such adevice broadly. I prefer also and have shown in the drawings that theportable protectingwall be moved into place by the charging mechanism.

It requires several hours by the present mode of repairing these archesto get the protecting-wall into position, while by my invention the samecan be accomplished in a few minutes.

It will be understood that radical changes may be made in the form andconstruction of this device without departing from the spirit of theinvention.

I have illustrated in the drawings forming a part of this specificationa simple construction of one form of my invention as applied to asmelting-furnace.

Figure 1 is a front elevation of a portion of a furnace, showing severalcharging-openings. Fig. 2 is a vertical section through one of saidopenings, showing my invention adapted thereto, and Fig. 3 is aperspective view of the arch-plate and shield.

Similar reference characters refer to similar parts throughout theseveral views.

The front wall 5 of the furnace is provided with aplurality ofcharging-openings 6, which are usually rectangular, with an arch 7forming the top side. In Fig. 1 is shown the ordinary doors 8 tonormally close the openings 6 and arranged to be guided in the verticalways 9. In Fig. 1 one door 8 is shown raised and my improved arch-plateand shield in position, but with the mechanism for holding the sameremoved. I v 7 While I prefer to hold the arch-plate and shield inproper position bythe ordinary charging mechanism, I desire to have itunderstood that any convenient mechanism may be provided for thispurpose.

As previously stated, the arches 7 are accidentally'broken or partlybroken during the regular operations, and these arches must be repairedwhile the fires are burning within the furnace.

My device consists of the arch-plate 10, which serves to support thebrick or similar work in place during construction, and the shield 11,which substantially closes the opening 6 completely.

I prefer having the vertical flange 12 on the inner edge of thearch-plate 1O serve as a stop to rest the arch-bricks against duringconstruction.

Obviously the shield 11 will protect the mechanics on the exterior ofthe furnace from the extreme heat on the interior of the furnace.

When the device is handled by the ordinary charging mechanism, the frontface of the shield 11 is provided with two parallel lugs or ridges 13and a perforation 14 to lit cooperating parts on the charging mechanism.

In operation when an arch 7 is in need of repair thedoor 8 is raised outof the way. The arch-plate 10 and shield 11, which are preferablyintegral, are placed and held in proper position, care being taken tohave the outer face of the flange 12 flush with the inner face of thewall The mechanics can now proceed with the necessary repairs withoutany great inconvenience on account of the heat on the interior of thefurnace. As soon as the repairs are complete the device is removed fromthe opening by the mechanism already referred to.

Having thus fully described my invention,

what I claim, and desire to secure by Letters Patent of the UnitedStates, is

1. A combined arch-plate and shield, said arch-plate supporting an archover a furnaceopcning and said shield closing said opening.

2. A combined arch-plate and shield, comprising a shield to close theopening in a furnace, an arch-plate to support an arch over said openingand an upward-extending flange on the inner edge of said arch-plate.

3. In an arch-plate and shield the combination of a fire-shield to [itinto the opening of a furnace, an arch-plate integral with the upper endof said shield to support an arch above said opening, an upwardextension on the inner edge of said arch-plate, and two flanges on theouter face of said lire-shield with a hole in the shield between saidflanges.

4. A combined arch-plate and shield, said arch-plate arranged to supportan arch over a furnace-opening and said shield arranged to lit into saidopening.

In testimony whereof I have signed my name to this specification, in thepresence oftwo subscribing Witnesses, this 2d day of November, 1903, atChicago, Illinois.

FRED. JOHNSON.

\Vitnesses:

R. J. JAGKER, A. U. DECKER.

